MST’s 8003101 Calibration Kit is furnished with a non-adjustable regulator to ease the calibrating procedure. WARNING: To avoid damage to the monitor’s sensor, regulator provided in this kit must be used. Before attempting to use this kit, be certain that the components are connected as shown in the sketch below and read the section on “CALIBRATION AND ADJUSTMENT” in the instruction manual furnished with the instrument. It will save time and conserve calibration gas if the instrument is “warmed up” and the calibration adjustment controls have been located on the instrument prior to screwing the regulator on to the test gas cylinder.